National Repository of Grey Literature 147 records found  1 - 10nextend  jump to record: Search took 0.00 seconds. 
Steam turbine for biomass power plant
Chumchal, Ondřej ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
This thesis deals with the design of a steam turbine for a biomass unit in two alternative solutions, with and without gearbox, for a given 30 MW clamp power. The design of both solutions works with the same heat cycle scheme, but the parameters at the low-pressure heater or at the inlet to the feed tank differ depending on the steam conditions in the turbine intakes. In the first part of the paper, a thermal balance scheme with low pressure regeneration is proposed and the steam flow through the turbine is calculated. Both variants have three unregulated bleeds, one of which is led to the degasification feed tank. For both variants a regulative stage is designed using impulse system of blading and a stage section using reactive blading. The work also includes the determination of axial force and the associated design of the balancing piston and gland steam system. Appropriate bearings were selected for the given force stresses. A graphical comparison of the two variants is presented in the paper, together with the operating characteristics. Finally, a conceptual section drawing of the steam turbine was made. The result is a turbine without gearbox with 36 stages and an efficiency of 82%, then with gearbox at 5400 min-1 with 27 stages and a thermodynamic efficiency of 86.7%.
Nuclear power plant condenser design
Havel, Jaroslav ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
The submitted bachelor’s thesis deals with the design of a condenser for the new Dukovany II nuclear power plant with an electrical output of 1,200 MW. The specified condensation parameters reflect typical parameters of pressurized light-water moderated and cooled reactors of the same power and climatic conditions in the given location. From the assignment of the thesis and the research carried out, the following requirements for the designed device emerged: to ensure the condensation of steam in the secondary circuit in filmwise condensation mode, to comply with the maximum cooling water heating of 10 K, to install the tube bundle at optimum angle and to ensure the competitiveness of the product. For the selected concept with a four-body condenser, a thermal analysis was made and solved numerically by a fixed-point iteration method. The calculation was performed using the EES software. The results showed that a heat transfer surface area of 121,263.96 m is required to ensure failure-free operation of the condenser. Each condenser body consists of 31,400 titanium tubes with a cross-section of ( 22 × 0,5) mm and a length of 14,554 mm. A dimensional drawing is also attached.
Comparison of the concept nuclear power plants feedwater heaters
Špaček, Michal ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
The topic of this master thesis is comparison of the concept nuclear power plants feedwater heaters. At the beginning, a brief recherche is written in which the types of nuclear reactors and the heat regeneration system are described. In the next part of the thesis, the heat balance diagram of the nuclear power plant is proposed and the parameters found in the design are further used for the thermal calculation of the feedwater heater of low and high pressure regeneration. The thermal calculation is performed for both horizontal and vertical designs. Finally, a basic dimensional design is made for both designs and these designs are compared with each other.
Steam turbine for SMR
Guliš, Jan ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
This master’s thesis deals with the design of condensing steam turbine for small modular reactor (SMR) with nominal heat power of 250 MW. Steam turbine is designed in two variants. The first variant operates with all the heat power of nuclear reactor. In the second variant the heat power is equally divided into two identical steam turbines so the designed turbine process half of the heat power. In the first part of the paper the haet balance diagrams with low pressure regeneration are proposed. In both cases the turbine has a total of four bleeds. Three bleeds for low pressure heaters and one bleed for degasification system in feed water tank. Both turbines are designed with an impulse stage and reaction blading. Turbine that processes all the heat power is designed without gearbox at nominal rpm of 3000, contains 15 stages and achieves a clamp power of 71,11 MW. Turbine that operates with half of the heat power is designed with a gearbox at nominal rpm of 4500, has 14 stages and clamp power of 34,91 MW. The consumption characteristics are created for both of designed steam turbines. Drawing of the turbine section is attached to the thesis.
Design of gland steam system for steam turbine
Skopal, Jiří ; Fiedler, Jan (referee) ; Kracík, Petr (advisor)
The Bachelor thesis deals with the design of a gland steam system for a steam turbine. The main focus of the the thesis is the creation of a functional P&ID scheme and the development of a 3D model of the gland steam and vent steam system. The thesis is divided into five parts. The first part provides a basic description of the gland steam system, its key components, and the creation of a heat and mass balance scheme based on the input values provided by Doosan Škoda Power company. The second part involves hydraulic calculation of the piping system, including the determination of nominal pipe sizes. The third part is dedicated to the created P&ID scheme. This section provides a detailed description of the principles and organization of the P&ID scheme using the KKS coding, as well as description of individual technological units in the P&ID scheme. The next part presents the created 3D model. Doosan Škoda Power company provided a power plant where the gland steam and vent steam piping system is modelled. The output of the 3D model includes images of the gland steam and vent steam system, as well as pipe isometrics of selected system components. The final part of the thesis includes the structural calculation of the piping system according to applicable standarts. This part verifies that the created gland steam and vent steam piping system meets safety requirements.
The development of energetics in the Czech Republic during the following years
Musil, Miloš ; Kracík, Petr (referee) ; Toman, Filip (advisor)
This thesis analyses the current Czech energy sector. It describes its current state and outlines possible scenarios of its development in future years in the context of the energy transformation. The thesis seeks to analyse the current situation of the energy sector in the country, assess its strengths and weaknesses and identify opportunities and threats for future development. The thesis describes the different parts of the Czech energy sector, such as the electricity, gas, heating and oil industries, including production sources, consumption and emissions. Most emphasis is given to the electricity sector. The capacities and potentials of the different sectors are analysed alongside the possible future scenarios outlined. Part of the thesis is also focused on describing and explaining the composition and construction of electricity and gas prices in the Czech Republic. Emphasis is also placed on placing the Czech energy sector in the broader context of the energy sectors of European countries and includes various scenarios for the development of the electricity sector in Europe. In the context of the current geopolitical situation in Europe and the modernisation and transformation of this sector, it is necessary to build new energy sources.
Steam turbine for a waste incinerator
Balažovič, Lukáš ; Kracík, Petr (referee) ; Fiedler, Jan (advisor)
The diploma thesis contains the design and comparison of two steam turbines for a waste-to-energy plant. One turbine is single shaft and the second is divided into two parts, high speed and low speed, on two separate shafts. A thermodynamic calculation of the blading of both variants is performed and subsequently evaluated. Furthermore, the axial and radial forces in the turbine are calculated, based on which suitable bearings are selected. At the end of the thesis, a simplified economic comparison is made for the winter operation when the steam goes to the central heating system. In the case of the single shaft turbine, about 10 % of the steam is thwarted in the low pressure section of the turbine, while in the second variant all the steam goes to the heat exchanger. Based on the design, three conceptual drawings are drawn.
Conceptual design of a nuclear power source based on a small modular reactor
Duchoň, Jan ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
This master’s thesis focuses on conceptual design of new nuclear energy source based on small modular reactor with use in heating industry. The reactor SMART was chosen as a fitting candidate. Based on parameters of the reactor, a thermal diagram was created, containing basic components such as steam generator or condenser. Mass balance was determined. A heat exchanger station for use in heating industry was designed. Lastly, basic parameters of some of the main components were designed.
Calculation of a heat exchanger in a nuclear power plant
Borovička, Matej ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
The main theme of this bachelor thesis is a theoretical and computational description of the steam generator. The first chapter deals with a brief description of nuclear power plants. Particular attention is paid to the power plants of the VVER type, which are used in the Czech and Slovak Republic. The theoretical part of this thesis describes the individual components which are important for the operation of a nuclear power plant. The main part of this thesis depicts horizontal and vertical steam generators. Moreover, the PGV-213 type of steam generator that is used in the Dukovany nuclear power plant is more precisely explained. The computation part of this thesis is devoted to the balance and heat calculations of the steam generator. At the conclusion of this thesis, the performance of the steam generator during changes in operating conditions is also described.
Condenser design of a nuclear power plant
Ondráček, Marek ; Kracík, Petr (referee) ; Milčák, Pavel (advisor)
In the beginning of the bachelor’s thesis is a brief view on nuclear energy. The next part of the thesis presents the principle of Nuclear power plant Dukovany and it explains the primary, secondary and tertiary circuit. In the secondary circuit it describes the condensation system and its most important components. Furthermore, the work focuses on a description and a calculation of the main condenser in Nuclear power plant Dukovany. The calculation focuses on a size of heat transfer surface and observation of condensation parameters when changing operation conditions.

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